为了防止会议中断,技术人员提前准备了一台备用电脑。Wèile fángzhǐ huìyì zhōngduàn, jìshù rényuán tíqián zhǔnbèi le yì tái bèiyòng diànnǎo.To prevent the meeting being interrupted, the technician prepared a backup computer in advance.
车里放着一个备用轮胎。Chē lǐ fàng zhe yí gè bèiyòng lúntāi.There is a spare tire in the car.
请把备用钥匙放在我这里。Qǐng bǎ bèiyòng yàoshi fàng zài wǒ zhèlǐ.Please leave the spare key with me.